Medium severity4.3NVD Advisory· Published Feb 26, 2021· Updated Jun 17, 2026
CVE-2021-23969
CVE-2021-23969
Description
As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that’s not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage." Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination's origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
44< 86+ 4 more
- (no CPE)range: < 86
- (no CPE)range: < 78.8
- (no CPE)range: <86
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <86.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.8
< 78.8+ 2 more
- (no CPE)range: < 78.8
- (no CPE)range: <78.8
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.8
- osv-coords34 versionspkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2pkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Server%204.0pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Proxy%204.0
< 78.8.0-3.133.1+ 33 more
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-8.32.2
- (no CPE)range: < 78.8.0-8.15.4
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
- (no CPE)range: < 78.8.0-78.120.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.8.0-lp152.2.49.1
- (no CPE)range: < 78.8.0-lp152.2.35.1
- (no CPE)range: < 78.8.0-112.51.1
- (no CPE)range: < 78.8.0-3.133.1
Patches
Vulnerability mechanics
References
8- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- lists.debian.org/debian-lts-announce/2021/03/msg00000.htmlnvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202104-09nvdThird Party Advisory
- security.gentoo.org/glsa/202104-10nvdThird Party Advisory
- www.debian.org/security/2021/dsa-4866nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-07/nvdRelease NotesVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-08/nvdRelease NotesVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-09/nvdRelease NotesVendor Advisory
News mentions
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